Improvement in joints of spectacle-bows



UNITED STATES PATENT EEICE.

IMPROVEMENT IN JOINTS OF SPECTACLE-BOWS.

Specification forming part of Letters Patent No. 54,273, dated May l,1866.

To all whom it may concern:

Be it known that I, HENRY O. AMMIDOWN, of Southbridge, in the county ofWorcester and State of Massachusetts, have invented new and usefulImprovements in the Joints of Spectacle-Bows with their Frames; and I dohereby declare that the following, taken in connection with the drawingswhich accompany and form part of this specification, is a description ofmy invention sufficient to enable those skilled in the art to practiceit.

This invention may be best described and understood by having referenceto the old construction, upon which my invention is an improvement. Saidconstruction is shown in the first four figures of the drawings, Figurel showing a side view of the old joint; Fig. 2, an end view of the same;Fig. 3, a plan, and Fig. 4 a side view, of the bow part ofthe joint.

The objections to the joint shown in said figures are these: First, itis large and heavy in appearance, making it an object to reduce the sizethereof; second, the bow part of the joint is complex, being made of twoparts, one separate` from the bow and riveted thereto; third, the pivotfor the bow is separate from the screw which secures the joint and holdsthe glass between the parts of the frame; fourth, the joint hasprojecting angles, which are objectionable from their liability to cntand scratch, and as the bows are opened the joints form nippcrs orpinchers of a very disagreeably effective knd, seizing and tearing thehair and skin.

Besides the reduction in the size of the joint, the objects of myinvention. are to simplify it, to lessen its cost, and to avoid angles,projections, aud nipping or pinching` as the bows are opened and closed.

Still referring to the rst four figures showing the old construction, Iwill explain that the piece a is formed separate from the bow b, saidpiece being made with a square pin, which enters a square hole in thewide curved part of the hinge end of the bow, and is there riveted.

The two pieces c c, which are brazed to the frame, are of the form shownin Figs. 1 and 2, and are arranged to receive a holding-screw at e andalso a pivot at f, on which the bow b plays. rlhe pieces c c arecounterbored from their faces, which come into contact, so as to admitbetween them the piece a with the pivot passing through. The check toopening the bow too wide is obtained by the abutment of the two faces atg g, which, being prominent and without cover or protection, cause greatannoyance in catching and nipping.

Reference now being had to the drawings showing my improved joint, thedifferences be- "tween it and the described old joint will be obvious.

Figs. 5 and 6 show my joint in side and end elevations, respectively,while Figs. 7 and S show, respectively, a plan and a side eleva-tion ofthe joint end of the bow.

In these last four figures, h t are the pieces which are brazed to thcframe t', and between which, in a counter-bore or recess formed aroundthe joining-screw, the joint end of the bow moves. This joint end of thebow is perfectly hat and of the same th ckness with the rest of the bow,no second piece being required.

The shoulder seen at jj, Figs. 7 and 8, impinging against the stopformed at k, Fig. 9, which shows, in elevation, one ofthe inner faces ofthe pieces h h.

It will be seen that the stops j and 7c are so located and arranged asto be fully protected by andare within the perimeter of the pieces 71lh, so that in the 1Sforking of the joint no nipping` or pinching canoccur.

It will also be seen that the holding-screw serves the function ofclamping the glass and the bow and of a pivot for the bow, and that thewhole joint. is one of the fewest possible parts, and is of extremesimplicity and compact-ness.

I claim- A spectacle-j oint having a construction substantially asdescribed.

HENRY O. AMMIDOWN.

Witnesses: j

THEoDoRE HARRINGTON, HERBERT L. EDMoNDs.

